"Your last mission is to annoy the heck out of the guy who summoned you, do your best," Billy said after using Mind Control on the ice dragon.
The ice dragon tried to resist as if he could sense the connection between them, but in the end, that resistance didn't last for long. The beast flew toward the summoner, and that guy noticed that he couldn't keep Icarus and Lucyna at bay while he attacked the ice dragon. Billy also seemed to be preparing something, so he had to keep his guard up to avoid problems. He could withstand some attacks, but if he gets caught by surprise... the summoner will give Billy a perfect chance.
The summoner began to fly away from the area, but the dragon was equally fast… as expected. He was smart enough to do that in order not to expose his back to those two. Still, Billy didn't imagine that he would use Fire Breath soon after… he truly wanted to overpower his own beast in the thing that the dragons were really good at.